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Fair Value Measurements and Derivative Instruments - Schedule of Fair Value and Line Item Caption of Derivative Instruments (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Asset Derivatives [1] $ 212 $ 71
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Liability Derivatives [1] $ 64 $ 139
Interest rate swaps    
Asset Derivatives    
Asset Derivatives [1] 32 58
Liability Derivatives    
Liability Derivatives [1] 0 0
Foreign currency forward contracts | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 172 0
Liability Derivatives    
Liability Derivatives [1] 0 71
Foreign currency forward contracts | Other assets    
Asset Derivatives    
Asset Derivatives [1] 0 0
Foreign currency forward contracts | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 0 22
Fuel swaps | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 6 10
Liability Derivatives    
Liability Derivatives [1] 31 19
Fuel swaps | Other assets    
Asset Derivatives    
Asset Derivatives [1] 2 3
Fuel swaps | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] $ 33 $ 27
[1] Subtopic 815-20 “Hedging-General” under ASC 815.